Re: [PATCH 05/19] KVM: PPC: Book3S HV: add a new KVM device for the XIVE native exploitation mode

On 1/22/19 6:05 AM, Paul Mackerras wrote:

On Mon, Jan 07, 2019 at 07:43:17PM +0100, Cédric Le Goater wrote:

quoted

This is the basic framework for the new KVM device supporting the XIVE
native exploitation mode. The user interface exposes a new capability
and a new KVM device to be used by QEMU.

[snip]

quoted

@@ -1039,7 +1039,10 @@ static int kvmppc_book3s_init(void)
 #ifdef CONFIG_KVM_XIVE
 	if (xive_enabled()) {
 		kvmppc_xive_init_module();
+		kvmppc_xive_native_init_module();
 		kvm_register_device_ops(&kvm_xive_ops, KVM_DEV_TYPE_XICS);
+		kvm_register_device_ops(&kvm_xive_native_ops,
+					KVM_DEV_TYPE_XIVE);

I think we want tighter conditions on initializing the xive_native
stuff and creating the xive device class.  We could have
xive_enabled() returning true in a guest, and this code will get
called both by PR KVM and HV KVM (and HV KVM no longer implies that we
are running bare metal).

Ah yes, I agree. I haven't addressed at all the nested flavor. I have 
some questions about this that I will ask in summary email you sent. 

Thanks,

C. 
  

quoted

@@ -1050,8 +1053,10 @@ static int kvmppc_book3s_init(void)
 static void kvmppc_book3s_exit(void)
 {
 #ifdef CONFIG_KVM_XICS
-	if (xive_enabled())
+	if (xive_enabled()) {
 		kvmppc_xive_exit_module();
+		kvmppc_xive_native_exit_module();

Same comment here.

Paul.